# Time Vault Pools

The most common question people ask is *where does the upfront yield come from?*

Ultimately, Time Vaults use multiple methods of "Pools" to make upfront yield possible. Here are three of the current most used pool types that enable upfront yield.

* Yield Pools
* Liquidity Pools
* Boost Pools

### Example #1: Yield Pool

*How it works:*

* When Time Vault begins generating yield from it's yield source (Aave, Lido, etc), the yield is redirected into a "Yield Pool"
* The only way to get the yield out of the Yield Pool is by burning TBTs
* The amount of yield you can withdraw from Yield Pool is proportional to a user's ownership of TBTs
* For example: If a user owns 10% of all TBTs from this Time Vault, they have the rights to burn and redeem 10% of all yield in this Yield Pool

*Overview:*

* Available Yield: Generated from previous stakers principal
* Yield Claim: Burn TBTs
* Pro: Creates perpetual available yield source
* Con: Takes time to jumpstart and accumulate.

### Example #2: Liquidity Pool

*How it works:*

* Individuals can add liquidity to TBT tokens
* For example: ETH/TBT
* When a user mints TBTs from a Flashstake, the TBT tokens are sold into this Liquidity Pool.
* In this model, LPs are providing this upfront yield so they can earn trading and potentially liquidity mining fees.

*Overview:*

* Available Yield: Generated from TBT liquidity providers
* Yield Claim: Swap TBTs
* Pro: Creates liquidity for TBTs
* Con: Must attract LPs

### Example #3: Boost Pool

*How it works:*

* Anyone can deposits money directly into a Boost Pool
* For example: Blockzero Labs deposits $1000 USDC into the Aave v3 Time Vault
* When a user mints TBTs from a Flashstake, the TBT tokens are burned to redeem USDC from the Boost Pool
* In this model, anyone can subsidize the cost to jumpstart a Time Vault

*Overview:*

* Available Yield: Donated by person or entity
* Yield Claim: Burn TBTs
* Pro: Easy to start
* Con: Donation is an expense